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[ASP.net教程]GPRM/GNRMC定位信息的读取与解析


帧头

UTC时间

状态

纬度

北纬/南纬

经度

东经/西经

速度

$GPRMC

hhmmss.sss

A/V

ddmm.mmmm

N/S

dddmm.mmmm

E/W

 

 

 

 

方位角

UTC日期

磁偏角

磁偏角方向

模式

校验

回车换行

ddmmyy

000 - 180

E/W

A/D/E/N

*hh

CR+LF

 


 

 

 

 

 

格 式: $GPRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>*hh<CR><LF>
$GPRMC,024813.640,A,3158.4608,N,11848.3737,E,10.05,324.27,150706,,,A*50
说 明:
字段 0:$GPRMC,语句ID,表明该语句为Recommended Minimum Specific GPS/TRANSIT Data(RMC)推荐最小定位信息
          字段 1:UTC时间,hhmmss.sss格式
          字段 2:状态,A=定位,V=未定位
          字段 3:纬度ddmm.mmmm,度分格式(前导位数不足则补0)
          字段 4:纬度N(北纬)或S(南纬)
          字段 5:经度dddmm.mmmm,度分格式(前导位数不足则补0)
          字段 6:经度E(东经)或W(西经)
          字段 7:速度,节,Knots(一节也是1.852千米/小时)
          字段 8:方位角,度(二维方向指向,相当于二维罗盘)
          字段 9:UTC日期,DDMMYY格式
          字段10:磁偏角,(000 - 180)度(前导位数不足则补0)
          字段11:磁偏角方向,E=东,W=西
          字段12:模式,A=自动,D=差分,E=估测,N=数据无效(3.0协议内容)
          字段13:校验值

 /// <summary>  /// GPS信息  /// </summary>  public class GPSInfo  {    public string Longitude;//经度    public string Latitude; //纬度    public string Speed;  //速度    public string GPSStatus;//GPS状态 A=数据有效;V=数据无效    public string GPSTime;//GPS时间    public string GPSHeading;//航向  }  /// <summary>  /// GPS/BD定位信息解析  /// </summary>  public static class GPSAnalysisClass  {    /// <summary>    /// 打开串口    /// </summary>    /// <param name="_SerialPort">SerialPort</param>    /// <param name="_PortName">PortName</param>    /// <param name="_BaudRate">BaudRate</param>    /// <returns></returns>    public static bool OpenSerialPort(SerialPort _SerialPort, string _PortName, int _BaudRate)    {      bool Ret = false;      try      {        _SerialPort.Close();        _SerialPort.PortName = _PortName;        _SerialPort.BaudRate = _BaudRate;        _SerialPort.NewLine = Environment.NewLine;        _SerialPort.Open();        if (_SerialPort.IsOpen)          Ret = true;      }      catch (Exception ex)      {        Console.WriteLine(ex.Message);        Ret = false;      }      return Ret;    }    /// <summary>    /// GNRMC解析[北斗]    /// </summary>    /// <param name="_RecString">原始字符串</param>    /// <returns>北斗定位信息</returns>    public static GPSInfo GNRMCAnalysis(string _RecString)    {      GPSInfo gpsInfo = null;      string[] strtemp = _RecString.Split('\n');      for (int i = 0; i < strtemp.Length; i++)      {        string[] strtemp1 = strtemp[i].Split(',');        if (strtemp1.Length >= 12)        {          if (strtemp1[0] == "$GNRMC")          {            gpsInfo = new GPSInfo();            gpsInfo.GPSStatus = strtemp1[2];            gpsInfo.GPSHeading = strtemp1[8];            gpsInfo.Speed = strtemp1[7] == "" ? "" : Convert.ToDouble(Convert.ToDouble(strtemp1[7]) * 1.852).ToString("0.0");            gpsInfo.Latitude = strtemp1[3] == "" ? "" : GPSTransforming(strtemp1[3]).ToString("0.000000");            gpsInfo.Longitude = strtemp1[5] == "" ? "" : GPSTransforming(strtemp1[5]).ToString("0.000000");            gpsInfo.GPSTime = strtemp1[9] == "" ? "" : "20" + strtemp1[9].Substring(4, 2) + "-" + strtemp1[9].Substring(2, 2) + "-" + strtemp1[9].Substring(0, 2) + " " + strtemp1[1].Substring(0, 2) + ":" + strtemp1[1].Substring(2, 2) + ":" + strtemp1[1].Substring(4, 2);          }        }      }      return gpsInfo;    }    /// <summary>    /// GPRM字符串解析[GPS]    /// </summary>    /// <param name="_RecString">原始字符串</param>    /// <returns>GPS定位信息</returns>    public static GPSInfo GPRMCAnalysis(string _RecString)    {      GPSInfo gpsInfo = null;      if (!string.IsNullOrEmpty(_RecString))      {        _RecString = _RecString.Contains("\r") ? _RecString.Substring(0, _RecString.IndexOf("\r")) : _RecString;        string[] seg = _RecString.Split(',');        if (seg.Length >= 12)        {          gpsInfo = new GPSInfo();          gpsInfo.GPSStatus = seg[2];//状态          gpsInfo.GPSHeading = seg[8];//角度          gpsInfo.Speed = seg[7] == "" ? "" : (Convert.ToDouble(seg[7]) * 1.852).ToString("0.0");//速度          gpsInfo.Latitude = seg[4] == "" ? "" : GPSTransforming(seg[3]).ToString("0.000000");          gpsInfo.Longitude = seg[6] == "" ? "" : GPSTransforming(seg[5]).ToString("0.000000"); ;          gpsInfo.GPSTime = seg[9] == "" ? "" : string.Format("20{0}-{1}-{2} {3}:{4}:{5}", seg[9].Substring(4), seg[9].Substring(2, 2), seg[9].Substring(0, 2), seg[1].Substring(0, 2), seg[1].Substring(2, 2), seg[1].Substring(4));        }      }      return gpsInfo;    }    /// <summary>    /// 降度分秒格式经纬度转换为小数经纬度    /// </summary>    /// <param name="_Value">度分秒经纬度</param>    /// <returns>小数经纬度</returns>    private static double GPSTransforming(string _Value)    {      double Ret = 0.0;      string[] TempStr = _Value.Split('.');      string x = TempStr[0].Substring(0, TempStr[0].Length - 2);      string y = TempStr[0].Substring(TempStr[0].Length - 2, 2);      string z = TempStr[1].Substring(0, 4);      Ret = Convert.ToDouble(x) + Convert.ToDouble(y) / 60 + Convert.ToDouble(z) / 600000;      return Ret;    }  }